PLEASE HELP ASAP . what else does this have??

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Stage in which a typical star has completely stopped fusion

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3